s-Block ElementsHard
Question
Be and Al have following resemblance due to diagonal relationship :
Options
A.have nearly equal electronegativity
B.form amphoteric oxides
C.have same charge/radius ratio
D.both form dimeric halides
Solution
(A) Because of diagonal relationship both have same electronegativity (Be = 1.5 & Al = 1.5).
(B) Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion, [Be(OH)4]2- just as aluminium hydroxide gives aluminate ion, [Al(OH)4]- and salt with acids.
(C) The ionic radius of Be2+ is estimated to be 45 pm; the charge/radius ratio is nearly the same as that of the Al3+ ion (the charge per unit area is nearly similar, Be2+ = 2.36 and Al3+ = 2.50).
(D) The chlorides of both beryllium and aluminium have Cl- bridged chloride structure in vapour phase.
(B) Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion, [Be(OH)4]2- just as aluminium hydroxide gives aluminate ion, [Al(OH)4]- and salt with acids.
(C) The ionic radius of Be2+ is estimated to be 45 pm; the charge/radius ratio is nearly the same as that of the Al3+ ion (the charge per unit area is nearly similar, Be2+ = 2.36 and Al3+ = 2.50).
(D) The chlorides of both beryllium and aluminium have Cl- bridged chloride structure in vapour phase.
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